Method and mechanism for erection of prefabricated modular deck of viaducts, motorway flyovers and the like

A method for erection of prefabricated modular deck of viaducts or motorway flyovers with a road elevated above the ground crossing the viaduct, at least one pair of supports a deck module to be set on, a road leading to at least one of said supports, providing delivery of said deck module to said supports such that when the deck module placed on its carrier reaches said supports the deck module is located above them, comprising the following successive steps:

• installing a mobile bridge consisting of at least two towers moveable up and down and a platform with at least one expandable end between said supports under the place where the module should be erected, such that said towers are located left and right from the elevated road and the platform is located above the elevated road;
• moving the platform up until its top surface is leveled with a top surface of said road;
• expanding at least one expandable end of the platform faced to said road such that said road and the platform form a continuous way;
• delivering the deck module to said supports by its carrier using said road, and pulling the carrier over the platform;
• positioning the carrier on the platform such that the module is located directly above the places of said supports on which the module should be set;
• retracting the expandable end(s) of the platform and lowering the platform with the deck module and its carrier until the module is set on said supports;
• and
• continuing to lower the platform with the carrier released from the module until it reaches the level suitable for moving the bridge and the carrier away from position between said supports.

A method for erection of prefabricated modular deck of viaducts or motorway flyovers with at least first and second successive pairs of supports having one common support the deck modules are to be set on, a road leading to at least one of said supports, providing delivery of said deck modules to said supports such that when each of said deck modules placed on its carrier reaches said supports the deck module is located above them, the carrier of said modules which including a trailer and a tractor which total length is more than the distance between pair of said supports, comprising the following successive steps:

• installing the first and the second mobile bridges each of which consisting of at least two towers moveable up and down and a platform with at least one expandable end, between said first and said second successive pairs of supports, accordingly, under the place where the modules should be erected;
• leveling the top surfaces of the platforms of the bridges with the surface of said road leading to the supports;
• expanding at least one expandable ends of the platforms of the bridges such that the road and the platforms form a continuous way;
• delivering the deck module to said first pair of supports by said trailer and tractor using said road;
• pulling the trailer over the platform of the first bridge and the tractor over the platform of the second bridge;
• positioning the trailer on the platform such that the first module is located directly above the places of said first pair of the supports where the module should be set on;
• retracting the expandable ends of the first bridge and lowering its platform with the deck module and the trailer until the module is set on said first pair of the supports;
• and
• continuing to lower the platform of the first bridge with the trailer released from the module until it reaches the level suitable for moving the bridge and the trailer away from said first pair of supports.